Smoking pipe



N. MIKELsoN I 2,375,312

lslvxoKINcfPIPE May 8, 1945.

Filed Mlarcn' 2, 1943 /z/Omfa/ Mks/aw,

Patented May 8, 1945 SMUKING PIPE Nordal Mikelson, Sioux Falls, S. Dak.,assignor of forty-five per cent to R. E. Dickenson and W.J.

Dickenson, both of Sioux Falls, S. Dak.

Application March 2, 1943,, Serial No.4'77j727 4 claims' cl.131-`2o2This invention relates to tobacco pipes, and the primary object thereofis to provide in a pipe bowl a simple and effective means of preventingaccumulation of moisture in the lower part of the tobacco charge and inthe smoke duct, and furthermore to provide such means without materiallyadding to the cost of the pipe and without unduly complicating itsoperation.

A well known disadvantage of tobacco pipes of the usual sort isA thatmoisture from the burningV tobacco. tar, and similar combustionproducts, being drawn from the burning tobacco at the top of the charge,are passed through the underlying tobacco and condense in the unburnedtobacco, particularly at the bottom of the bowl and immediately adjacentthe entrance of the smoke duct. This rnoistureinterferes with properburning of the lower part of the tobacco charge, and the condensedcombustion products impart a harsh and disagreeable quality to the smokeproduced by the tobacco containing them. The progressive increase'inmoisture content of the 'tobacco as combustion advances through thecharge also results Vin condensation of increasing amounts of moistureand tar in the smoke duct, producing slugs that are drawn into the mouthof the smoker. The present invention overcomes these difiiculties byproviding passage for the smoke laterally from the combustion zone, to alarge extent avoiding passage of the smoke through the lower partl ofthe tobacco charge. Condensation of moisture and tar in the tobaccounderlying the combustion zone is largely eliminated and the pipe lbowlis thereby kept dry, permitting uniform combustion of the entire chargeand production of a uniform quality of smoke.

In the accompanying drawing;

Fig, 1 is a side elevation of a pipe having a bowl arranged inaccordance with this invention.

Fig. 2 is a plan view.

Fig. 3 is a sectional view on line 3 3 of Fig. 1.

Fig. 4 is an enlarged fragmentary longitudinal sectional view showingthe'novel portion of the pipe bowl.

Fig. 5 is a cross-sectional view of the smokeconducting element of theassembly.

Describing the drawing in detail, the pipe comprises, as usual, a stem 6and a bowl 'I provided with a wall 8 that en'closes a combustion chamber9. A smoke duct IE) c-ommunicates with the passage of the stem 6. In theusual form of pipe, a smoke duct corresponding to the duct l enters thebottom of the combustion chamber, so that all products of combustion aredrawn downwardly through the chamber and withdrawn at'the bottom of thebowl.` In the present bowl a smoke passage is extended alongside andparallel to the combustion 'chamber 9 and an elongate slot is providedfor direct withdrawal of the smoke from the combustion zone. This may beaccomplished,

as illustrated, by means of a tubular element 'll arranged in a well l2contained in the wallfB at one side of and parallel to the combustionchamber, with which the wellcommunicates by a gate 53. The smoke duct IU communicates With asmoke passage IG enclosed by the element H- by wayof a port l5.

Ingress to the smoke passage Hi enclosed by the element H, for smokefrom the combustion chamber 9, is provided by an elongate Vslot .|6.extended axially of the elementl H .and parallel to the direction ofadvance of the burning of the tobacco, which slot IS is exposed to theinteriorV of the combustion chamber 9 by the gate l3.

The top end of the tubular element Il; being closed by a plug H, it willbe seen that suction applied to the smoke 'duct l0|wil1 result ina our--rent of air being drawn through the combustionl V sistance to pass'ageof air, it is necessary to satisfactory operation of the pipe to preventpassage of air directly to the passage M above the combustionzone, Suchby-passing of the combustion zone is prevented by making the slot IBsufficiently' narrow to trap combustion products, including ash andcarbon, from the combustion zone, Which trapped products plug the slotprogressively along its length as the combustion zone advances, therebyblocking the slot against free entrance of air combustion and effectflow of smoke to the passage M and the duct IO. When a charge of tobaccohas been consumed, the trapped material plug-v gingthe slot IG can bereadily removed by blowing sharply through the duct H).

In order to facilitate the plugging of the slot IG, it is preferablyV-shaped in cross-section, as shown in Fig. 5, With the wider side ofthe slot arranged externally of the element Il and toward the combustionchamber 9. The inner, narrower side of the slot is wide enough to permitpassage of smoke, but sufiiciently narrow to trap fine ash andcarbonized tobacco,,and become plugged by such material.

Since a considerable part of the smoke entering the -passage I 4 by wayof the slot IS comes directly from the combustion zone, the smokeentering the passage 14 has hot and harsh qualities. To produce coolingand filtering efiects similar to those of tobacco underlying thecombustion zone in a standard pipe, the smoke passage Id is filled witha body l8 of filtering material. Advantageously this material istobacco, since by its use the normal flavor of the smoke is preserved,and the best qualities of a standard pipe are duplicated.

It has been proven by actual test that a pipe arranged in accordancewith the foregoing disclosure avoids the disadvantages of the standardtype of pipe bowl, and that a charge of tobacco burned therein will burnuniforinly and completely without appreciable condensation of moisturein the lower part of the charge or the smoke duct, resulting in acompletely dry pipe so far as delivery of harsh smoke and slugs ofcondensed moisture are concerned. The filtering material IR may bereplaced whenever necessary, the plug ll being removable for thepurpose.

I claim as my invention:

1. A tobacco pipe comprising a bowl having a said tube being incommunication adjacent to its lower end With said smoke duet, said tubehaving therein a slot substantially co-extensive in length therewith andalined With the slot in said bowl, said tube slot being sufi'icientlywide to afford ready passage for smoke from the combustion chamber intosaid tube and sufliciently narrow to trap combustion products fromtobacco burnt in the combustion chamber so as to become progressivelyplugged by said products above the bottom of the combustionzone as saidzone advances during burning of the tobacco.

2. A tobacco pipe as set forth in claim 1, in which the tube slot issubstantially of V-shape in crosssection and is wider toward thecombustion chamber than toward the smoke eduction passage and has aWidth toward the combustion chamber suflicient readily to receivecombustion products from the zone of burning of tobacco in the chamberand a width toward the smoke passage sufliciently narrow to trap suchcombustion products and become thereby plugged above the combustion zoneas the latter advances.

3. A tobacco pipe as set forth in claim 1 in Which the edges of thewalls defining the elongated tube slot are spaced a relatively widedistance apart at the combustion chamber side of tube and in which thedistance between the edges of the elongated spaced side walls of thetube slot away from the combustion chamber are substantially closertogether than the firstnamed edges of said walls.

4. A tobacco pipe including a bowl having a combustion chamber and awell separated by a division wall provided with a slot of substantiallyV-shape in cross-section affording communication therebetween, said slotbeing sufliciently wide to afford ready passage for smoke from thecombustion chamber into said well and sufiiciently narrow to trapcombustion' products from tobacco burnt in the combustion-chamber so asto become progressively plugged throughout its length from top to thebottom thereof by said products above the bottom of the combustion zoneas said zone advances during burning of the tobacco.

NORDAL MIKELSON.

